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extern "C" __declspec(dllexport)
HRESULT Connect(LPCSTR IpAddr, CHAR* pcUserName = NULL, CHAR* pcPassword = NULL)//·µ»Ø0±íʾÁ¬½Ó³É¹¦£¬·Ç0Ôòʧ°Ü
{
  ...
}

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Declare Function Connect Lib "C:\example.dll" (ByVal IpAddr As String, ByVal UserName As String, ByVal Passwd As String) As Integer

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Const NULL = 0

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Dim result As Integer

result = Connect("138.139.0.230", NULL, NULL)

If result <> 0 Then

  MsgBox("error_connect")

  Return

End If

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Const NULL = Nothing

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result = Connect("138.139.0.230", nothing, nothing)


result = Connect("138.139.0.230", String.Empty, String.Empty)£¿

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½øÈëµ½ MsgBox("error_connect")


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result = Connect("138.139.0.230", NULL, NULL)
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